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Race fan Jerry Matthews remembers years of races at the track and says he'll never forget Tuesday night's race.

"Years been coming, never seen anything like that," Matthews exclaims.

It was a little before 9 p.m., when halfway into the night's harness races, things went wrong.

"The horse in the lead position stopped, started causing a chain reaction," Lisa Watts, Rosecroft's Director of Operations, says.

Matthews adds, "One horse was in the air, then another and they ran into each other...I was saying, 'Oh my god, I hope nobody is dead'."

Five drivers were injured in the chaos, three needed extra medical attention.

First responders had to turn off their sirens, so they wouldn't scare the horses. A state police helicopter took the two most injured drivers to the hospital. They have broken bones but are expected to be okay.

Firefighters at the scene say they did not see any injured horses.

"I understand one gentleman wanted to know how his horses did in the remainder of the card," Watts says.